Radium Engineering FST-R Fuel Surge Tank with Integrated Fuel Pressure Regulator for E5LM Radium Titanium Vehicles

A Fuel Surge Tank (FST) is designed to prevent fuel starvation to the engine in vehicles with inadequate fuel tank baffling. The FST's fuel pump feeds the fuel rail(s). The volume of fuel inside the surge tank acts as a buffer to ensure the FST pump is always supplied. This volume is maintained by the main fuel tank's (lift) pump, as well as by the fuel returning from the fuel pressure regulator.

In the case of the FST-R, the regulator is integrated into the surge tank and recirculates fuel internally.

Excess fuel in the surge tank is returned to the vehicle's main tank. Installing a surge tank is also a simple way to upgrade a vehicle's fuel pump without having to open or modify the original tank. RADIUM FST-R FEATURES - Fully CNC machined aluminum construction with o-ring sealed interfaces - Anodized for compatibility with all fuel types - Integrated adjustable fuel pressure regulator with 1:1 vacuum reference - Interchangeable regulator orifice sizes to match different pump outputs - Nickel-plated electrical connector with 24" (61 cm) leads - Assembled with stainless steel hardware - Three 6AN male connections RADIUM FST-R The FST-R (Regulated Fuel Surge Tank) features an all-new design that houses an internal fuel pump and has an integrated fuel pressure regulator machined into the top cap. The high-flow regulator is adjustable and features different sized orifices. This revolutionary idea eliminates the need for an external fuel pressure regulator, as well as additional fittings and hoses. This simplifies installation, reduces overall cost, decreases weight, and eliminates potential leak points in the fuel system. Furthermore, this system allows for lower fuel temperatures, as fuel is not returned from the hot engine bay. Like all Radium fuel surge tanks, this universal product can be used in any fuel injected application and is compatible with all fuel types. More details on the FST-R design can be found here. The FST-R can be configured with all 39mm fuel pumps from many leading manufacturers. Note: The FST-R is not available in dual pump configurations. If the pump is purchased as part of the FST-R, the surge tank will come fully assembled. Pressure tested for leaks and ready for installation. If the pump is purchased elsewhere, some assembly will be required. For additional information on FST-R pump wiring, refer to the "MORE DETAILS" tab on this page (above). The side port is the regulated pressure output and connects directly to the fuel rail. No additional fuel pressure regulator is required. Pressure adjustment is made using the adjustment screw located on the regulator's top cap. A vacuum hose connects to the FST-R's nipple for a 1:1 vacuum reference. Note: Returnless fuel systems typically use constant fuel pressure. In this case, the vacuum reference hose is not required. The FST-R is no taller than a standard fuel surge tank with hoses installed. Two interchangeable orifices are included with flow diameters calculated to match the fuel pump's flow to the regulator. Additionally, this increased precision will prevent diaphragm flutter and optimize pressure stability.

For the 20-0368-00 Ti Automotive E5LM FST-R, a 20-0598 check valve is included to prevent backflow.

Instructions PDF